Gloucester Amateur Radio and Electronics Society

Club Project - Direction Finding Receiver

Aerial Board without Amplifier



For any members who just want a directional aerial with no amplification, we offer this design.

Like the other aerial designs in this section, it is based on a medium wave ferrite rod aerial ((LB12N from Maplins) that has been wrapped in tinfoil to provide directionability. Click here for full constructional details. The aerial is tuned with a 5.5pF to 65pF trimmer (WL72P from Maplins).

A 50 ohm coil on the aerial (the red and blue wires) provide the output to the receiver. There are no other components.

Construction

We built the sample on a small piece of Veroboard.



The best way to align the aerial is to use a grid (or gate) dip oscillator (GDO). Set the GDO to the required frequency by tuning it for zero beat against another receiver. Then tune the trimmer on the aerial board for a dip on the GDO's meter.

So, where to now.

On to the aerial construction details
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